Performance analysis of a single-user MISO ultra-wideband time reversal system with DFE

Abstract

This paper presents an analysis of the performance of a baseband multiple-input single-output (MISO) time reversal ultra-wideband system (TR-UWB) incorporating a symbol spaced decision feedback equalizer (DFE). A semi-analytical performance analysis based on a Gaussian approach is considered, which matched well with simulation results, even for the DFE case. The channel model adopted is based on the IEEE 802.15.3a model, considering correlated shadowing across antenna elements. In order to provide a more realistic analysis, channel estimation errors are considered for the design of the TR filter. A guideline for the choice of equalizer length is provided. The results show that the system's performance improves with an increase in the number of transmit antennas and when a symbol spaced Part of this work was presented in the ISSSTA'08 conference. equalizer is used with a relatively small number of taps compared to the number of resolvable paths in the channel impulse response. Moreover, it is possible to conclude that due to the time reversal scheme, the error propagation in the DFE does not play a role in the system's performance.

Generalized analysis of MU-MISO time reversal-based systems over correlated multipath channels with estimation error

“…The time reversal (TR) technique is one of the most popular forms of linear precoding, especially for ultra-wideband (UWB) systems over multipath channels. It is considered as a beamforming technique [2][3][4][5][6][7][8][9][10][11][12][13][14]. TR tightly focuses the energy of all the taps of the propagation channel, in the time and space domains at the intended terminals by utilizing the time-reversed of channel impulse response (CIR) to prefilter transmit signals.…”

“…Due to the focalization property of TR, much research efforts have been put recently on the analysis of TR-based transmission [5][6][7][8][9][10][11]. Popovski et al [6] give approximate derivations of ISI and IUI for TR-UWB system.…”

“…Popovski et al [6] give approximate derivations of ISI and IUI for TR-UWB system. The performance analysis of a MISO TR UWB system with a decision feedback equalizer is also found in [7]. The analysis conducted in [2,5,11] considers specific wideband channels where the average power of each tap decays exponentially.…”

Sistemas de banda ultralarga com pré-processamento.

“…Adicionalmente, os autores mostram, por meio de resultados de medição, a influência do número de antenas transmissoras na focalização temporal e no ganho de energia na recepção SONG et al, 2006;. ANGÉLICO et al, 2008aANGÉLICO et al, , 2011 e considerado neste capítulo, ou de esquemas de pré-equalização, como será considerado no Capítulo 4, pode ser necessária.…”